Mark Stephen Fedder, MD
Gastroenterology Physician · Maryville, IL
Mark Stephen Fedder, MD is a gastroenterology physician with a practice address in Maryville, Illinois, and NPI 1922009943, issued on Aug 2, 2005. Check the license (Illinois 036-067702, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark Stephen Fedder
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036-067702 IL
Self-reported in NPPES; status is on the state search - Practice location
- 6810 State Route 162, Maryville, IL 62062
- Phone
- (618) 288-0346
- Enumerated
- Aug 2, 2005
- Record last updated
- Dec 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (618) 288-0349
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 6810 State Route 162
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Stephen Fedder in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-067702Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average gastroenterology physician in 2024
626 Medicare Part D claims for 367 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf255 claims
- Omeprazole128 claims
- Pantoprazole Sodium83 claims
- Esomeprazole Magnesium22 claims
- Famotidine22 claims
- Linzess11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $59.57
3 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Stephen Fedder among 887 gastroenterology physician records in Illinois
Mark Stephen Fedder, MD is one of 887 gastroenterology physician records with a practice address in Illinois. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2020 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Maryville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Edmundo Rodriguez-Frias, MDMaryville, IL 620621912117912
- Francisco Tagle, MDMaryville, IL 620621588323356
- Karen Sein Ohn, MDGranite City, IL 620401518119536
- Mei Huang, M.D.Edwardsville, IL 620251417972597
- David Lotsoff, M.D.Edwardsville, IL 620251205807328
- Mark Allendorph, M.D.Alton, IL 620021922094002
- Ahmad Karadaghy, M.D.Alton, IL 620021619963063
- Khalid Naseer, MDAlton, IL 620021851341366
Common questions
What is Mark Stephen Fedder, MD's NPI number?
Mark Stephen Fedder, MD's National Provider Identifier (NPI) is 1922009943, issued on Aug 2, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stephen Fedder, MD located?
The NPPES record lists a practice address at 6810 State Route 162, Maryville, IL, 62062. Phone: (618) 288-0346. Providers update this record themselves, so call before visiting.
How can I verify Mark Stephen Fedder, MD's license?
NPPES lists Illinois license number 036-067702, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Stephen Fedder, MD prescribe under Medicare Part D?
In 2024, Mark Stephen Fedder, MD had 626 Medicare Part D claims for 367 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Mark Stephen Fedder, MD's MIPS final score?
The 2023 MIPS final score is 74.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.